If I were Bashir, I'd really be paranoid about medical conferences. He was on the way to a medical conference when the Dominion kidnapped him. He was on the way to a medical conference when Sloan kidnapped him. He was on his way to a medical conference when the Romulans kidnapped him...

Great Moment :

I don't like the idea of Section 31 at all, so there isn't much to choose from this one for me.

Factoid :

This is the first episode to feature Section 31.

Plotline

Bashir is subjected to intensive loyalty questioning by a Starfleet Intelligence. But nothing is quite what it seems, and soon he finds that he has become involved with a branch of the government so secret that nobody has ever even heard of it.